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    <a href="http://localhost:8989/index?a=1&b=2">get请求(query参数)</a>
    <a href="http://localhost:8989/user/333/李四">get请求(params参数)</a>
    <form action="http://localhost:8989/index/444" method="post">
        <input type="submit" value="提交">
    </form>
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